User friendiness

## Expected Behavior
Constrants colors, use of keyboard

## Actual Behavior
No such thing

## Steps to Reproduce the Problem

  1. Open GUI

## Specifications

  - YOLO version (check terminal of `About` section): 1.3.5 (8ab075242549b78b095533a2f01456ae165c22fa at 18:04:24 18-09-27 +0200)
  - Platform: any
  - Java version (check `java -version`): any